Machine for truing grindstones



(No-Modem P TRIER 24 sheets-Sheena `IVIAGHINB B0B TRUING GRINDSTONES.

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Unire@ Sfr-rires Parri-Nr @triep ifnANK TRIER, or WESTMINSTnn, ENGLAND, ASsieNon To A, o. BALDWTN,

or BOSTON, uASSAGI-IUSETTS.

MACHENE FOR TRUING GRlNDSTONES.

SPECIFCATION forming part of Letters Patent No. 293,203, dated february 5, i884.

Application filed October i8, 18?'5. (Nomodcl.)

To all whom it may concert/1,:

Be it known that I, FRANK TRIER, a Subj ect of the Queen of Great Britain, residing at W'estminster, England, have invented certain new and useful Improvements in Machines for Truing Grindstones, (for which I have obtained Letters Patent in England, No. 341 of January 20, 1883,) ofwhich the following is a specification, reference being had therein to of ,concentric cutters applied to the stone.

.moved toward each other across the faceof the stone. Fig. S is a sectional view of a cutter-bar in its socket for holding concentric cutters.

`Referring to the drawings, A is the bedplate, provided with slotted wings or extensions A, by means of which the frame A is secured to thetrough-frame of the grindstone, or to any other frame in which the stone to be dressed' is mounted. Both sides of the frame A are beveled off, as at a,'so as to form guideslides on which the cutter-carrier is free to move back and forth on the frame. One Side of the frame is provided with a projecting ledge, B', which protects the screw-shaft from dust and particles of stone, as will more fully appear. B is the cutter carrier or holder, the lower 4portion of which is beveled at b to fit'on the guides a. The cutter-carrier is 'moved back and forth on thefraine Aby means of a screwshaft, G, located in bearings in the ends of the frame A, said Shaft being `adapted to work into a nut or screw-threaded aperture in the forl:` or bracket F, secured to the under side of Fig. 7 is alntentcd in England January 20, 1F83, No. 341.

the cutter-carrier B, and is protected from dust and grit by means of the overhanging ledge B ofthe frame A.

E is a cylindrical sleeve or band surrounding the cutter-carrying bar O, provided with a projection, p, and a slot, O2. The cuttercarrying bar O is adapted to be moved back and forth within the sleeve E for adjustment to the stone to be dressed, and is held to the desired position onthe cutter-bar by means of a set-screw, f.

H is a Set-screw, which is seated in the cutter-carryin g frame B, and impinges against the end of the sleeve E and holds the cutter-bar up to its work and from. backward thrust. The projection p on the sleeve E is adapted to rest on the edge g of the hollow trough-like bottom H of the slide B, which lies underneath the sleeve and prevents the sleeve and cuttercarrying bar from turning around when working, and when it is desired to change the angle of the inclination ofthe cutter, as seen in the right hand of Fig. 4, -all that is necessary to be done is to turn the bar over and allow the projection p to rest on the edge g' of the troughv H'.

The stone is rotated in the direction indicated by the arrow y, which exerts a downward pressure on the sleeve E, and the tend.- ency is to rotate Said sleeve in the saine direction in which the cutter is rotated by its impingement against the stone; the stop p, however, coming in contact with the edge g of the trough, prevents the sleeve from turning farther.

It will be understood from Fig. 4, which is a plan View of the' machine operating on a Stone, that, when working, the invariable tendency is for the cutter-bar O and sleeve to turn around against the stop, and not in the other direction.

BZ is the bushing to which the cutter is secured, and is held in said bushing by means of the bolt C2.

It will be noticed that the hole in the bar O,

in which the bushing is secured, is at an angle to the axial line of said bar, so that when said bar is partially rotated the cutting angle of the cutter will be changed, as will more fully appear.

By further reference to Fig. 4 the cutter shown in full in position 1 is dressing across the periphery of the stone in the direction indicated by the arrow x, the cutter and cutterframe being carried across the frame A by turning the screw C. When the cutter has arrived about half-way across the stone, it is advantageous to allow ,the cutter to gradually withdraw or recede from the stone. This is done by slacking-the set-screw H. The cutter will then run out oi' cut into the position shown at 2. The cutter and cutter-carrying slide is then run or worked across the stone (out of cut) to the position shown at The bar Ois turned over and set into position by the setscrew H, and the stone is finished against a beveledface. To dress a true arris, the cutter is brought into position shown at 4, and caused to move in the direction of the arrow x2 by means of the set-screw H, the said cutter shaving the side ofthe stone as it proceeds.

In Fig. 7 I have shown two cutter-carriers mounted on a frame and operated by a single screw-shaft, r, which is provided with right and left handed threads, so that when the shaft fis turned the cutters will be caused to approach or recede from each other, as indicated by the arrows, and thus a plain level surface can be given to the face of the stone; or by mounting these cutters in holders,as inFigs. 3 and 4, the depth of vcut can be diminished as it proceeds toward the center, and the face of the stone be thus dressed with a beveled or rounded surface.

The cutter-carriers M N, Fig. 7, can be set at difterent'levels, so that their cuts can overlap each other. In Figs. 5 and 6 I have shown concentric cutters mounted in the carrying and adjusting devices j ust described, with theirv relative arrangement to the stone.

In Fig. 8 I have shown a sectional view of amode of mounting concentric cutters; but as this arrangement forms the subject-matter of a separate application, filed November 6,1883, No. 110,971, no further reference is made to it here.

I do not claiin in this application a cutter mounted on a spindle located within a sleeve or bushing, said sleeve being secured in an inclined hole in the cutter-carrying bars, as this is the subject-matter ofa claim in an application led by me October 18, 1883, Serial No. 109,359. Neither do I claiina round bar in which the cutter-spindle is set at an angle and contained wholly within the bar, nor a cutterholder in which the cutter-spindle is set eccentrically in a tube' or cylinder, and having an aperture for receiving the bushing ofthe cutter, and adapted in its seat to adjust the position of the cutter with relation to the stone, as these features are embraced in an application filed by me November 6, 1883, Serial No. 110,969.

Having thus described my invention, what I claim, and desire to secure by LettersPatent, is-- 1 In a stone working or dressing machine, the cylindrical sleeve adapted to be detachably secured to the cutter-carrying bar, provided with a lug, p, and slot o2, in combination with'the trough H and slide B, whereby the angle of inclination of the cutter can be changed by the partial rotation of the sleeve, as set forth. Y

2. In a stone-dressing machine, the cutter-,- carrying slide B, having a trough, H,in which is located a sleeve, E, for holding the cuttercarrier O, said sleeve being provided with a lug or projection, p, which is adapted to impinge against the edges of the trough, as and for the purpose set forth. v

3. The sleeve E, mounted in the slide B, as described, provided with the slotted projection p, in combination with the cutter-carrying bar O and set-screwsf and H, asset forth.

In testimony whereof I affix my signature in presence of two witnesses. Y

' FRANK frninn. Vitiiesses:

J. ENcLnR'r,

K. CHRIST. 

